Description of problem:
fmt was recently updated from 3.0.2 to 6.2.1 (bug 1925932). That update bumps the soname from libfmt.so.3 to libfmt.so.6. mkvtoolnix no longer installs and needs to be rebuilt against the new soname.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. yum install mkvtoolnix
Error: Package: mkvtoolnix-46.0.0-1.el7.x86_64 (epel)
FEDORA-EPEL-2021-54baf7b8c3 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-54baf7b8c3
FEDORA-EPEL-2021-54baf7b8c3 has been pushed to the Fedora EPEL 7 stable repository.
If problem still persists, please make note of it in this bug report.